Windows 10, Finale 27.3
My situation is similar, but... In my case there is no key change.
When I do "Display in Concert Pitch" the double-bar line goes away, but returns when showing transposition--even though there is no key change and no time change.
Odd, just a moment ago I did rid the "double-bar" but it is replaced with a single bar with space to the right (see below)
Perhaps unrelated, or not, for some reason my document seems to want to default to the percussion clef when I copy and paste.
Weird. Something is odd with this document.
Thank you in advance.